YOUNG Muslim girls travelling to marry Islamic State militants in Syria are being passed between men at a rate of one husband a week, according to a former jihadist.

British schoolgirls Kadiza Sultana, Amira Abase and Shamima Begum could face a similar fate

The extraordinary claim from a ex-member of the terror group - responsible for a series of brutal beheadings of Western hostages - comes amid growing concern about the influence of the group on British teenagers.

The informant claims young girls are forced to marry and sleep with older commanders in marriages that last just seven days, before being divorced and partnered with a new spouse.

The revelation will raise fresh fears over the fate of the three British schoolgirls, whom authorities fear have travelled to Syria to link-up with the extremists.

Shamima Begum, Amira Abase, both 15, and Kadiza Sultana, 16, left the UK last month, flying first to Turkey before traveling by land to the Syrian border.

PA

An informant claims young girls are paired with older IS militant in marriages that last just a week

Those Muslim girls were sleeping with some commanders under a marriage contract for a week only and then they were divorced and married to another one

Former Islamic State fighter

The east London schoolgirls, who attend the Bethnal Green Academy, are now believed to be in based in the Syrian town of Raqqa – the Islamic State's self-declared capital.

A 33-year-old former Islamic State fighter named Hamza has now described the shocking conditions young women might face if they travel to the war-torn region.

"There were some Tunisian Muslim girls who came from Syria," he told The Independent.

"Those Muslim girls were sleeping with some commanders under a marriage contract for a week only and then they were divorced and married to another one.

"I asked one of them how she had come to be in Syria and she answered that she had travelled first to Turkey and then across the Turkish-Syrian border."

AP

Turkish officials seized two boys aged 17 from London and a man aged 19 over the weekend

Hamza said he left the group after he was invited to rape girls the Islamic State had captured from the Yazidi community - a religious minority that has faced persecution by jihadist forces.

He said an invitation to behead a hostage also turned him away from the extremist group.

Describing murders he was forced to watch during his 'training' to join the Islamic State (otherwise known as Isis) , Hamza said he had avoided carrying out a beheading prior to fleeing the group.

"I had been shown some videos made with impressive visual and audio skill," he told the newspaper.

"After watching many of these, we were being taken to attend public executions.

"I was not ordered to do [an execution] because according to Isis rules, the trainee needs more than six months to be ready to carry out an execution."